There once was a kid you was the best returner in the NFL. But his issue was that they got to him so fast he couldn't return it. So the NFL decided that they would kick from the 35 instead of the 30. It was great for him and he was able to return again.
On the other hand Mike Westhoff to jets special teams coach said that back in 1994 when the kickoff wasn't exciting, everybody would go to the bathroom at that time. Then they moved it back so it would be more exiting. But it still wasn't enough to move it to the 30 yard line because players were getting hurt with how fast the other team was getting to him. Now that it is at the 35 I think the kickoff will have a higher chance of being returned for a touchdown. I am happy about that because it will be more fun to watch the person dodge all the people and score a touchdown.